POWER OF ATTORNEY

The undersigned, as a Section 16 reporting person of Limelight Networks, Inc. (the
"Company"), hereby makes, constitutes and appoints each of James R. Todd, Philip C. Maynard, Jeffrey W.
Lunsford, Rita Tocco, and Mark L. Reinstra, the undersigned's true and lawful attorneys-in-fact,
with full power and authority as hereinafter described on behalf of and in the name, place and
stead of the undersigned to:

1. prepare, execute, acknowledge, deliver and file Forms 3, 4 and 5 (and other forms
and all amendments thereto) with respect to the undersigned's ownership,
acquisition or disposition of securities of the Company, with the United States
Securities and Exchange Commission, any national securities exchanges and the
Company, as such attorneys-in-fact shall in their discretion determine to be
required or advisable pursuant to Section 16 of the Securities Exchange Act of
1934 (as amended) and the rules and regulations promulgated thereunder (the
"Exchange Act"), or any successor laws and regulations;

2. seek or obtain, as the undersigned's representative and on the undersigned's
behalf, information on transactions in the Company's securities from any third
party, including brokers, employee benefit plan administrators and trustees, and
the undersigned hereby authorizes any such person to release any such information
to the undersigned and approves and ratifies any such release of information; and

3.        perform any and all other acts which in the discretion of such attorney-in-fact are
necessary or desirable for and on behalf of the undersigned in connection with the
foregoing.

      The undersigned acknowledges that:

1.        this Power of Attorney authorizes, but does not require, each such attorney-in-fact
to act in their discretion on information provided to such attorney-in-fact without
independent verification of such information;

2. any documents prepared and/or executed by any such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney will be in such form and
will contain such information and disclosure as such attorney-in-fact, in his or her
discretion, deems necessary or desirable;

3. neither the Company nor any such attorneys-in-fact assumes (i) any liability for
the undersigned's responsibility to comply with the requirement of the Exchange
Act, (ii) any liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the undersigned for profit
disgorgement under Section 16(b) of the Exchange Act; and

4.        this Power of Attorney does not relieve the undersigned from responsibility for
compliance with the undersigned's obligations under the Exchange Act, including
without limitation the reporting requirements under Section 16 of the Exchange
Act.

      The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agent
shall have full power and authority to do or cause to be done all and every act and thing
whatsoever requisite, necessary or appropriate to be done in and about the foregoing matters as
fully to all intents and purposes as the undersigned might or could do if present, hereby ratifying
all that each such attorney-in-fact of, for and on behalf of the undersigned, shall lawfully do or
cause to be done by virtue of this Limited Power of Attorney.

      This Power of Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered to the Company and the foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 27th day of August, 2010.

ACKNOWLEDGMENT

Document Name: Power of Attorney

STATE OF CALIFORNIA        )
                        )
COUNTY OF SANTA CLARA        )

On August 27, 2010, before me, Katrina S. Edwards, Notary Public, personally appeared
Fredric W. Harman who proved to me on the basis of satisfactory evidence to be the person whose
name is subscribed to the within instrument and acknowledged to me that he executed the same in
his authorized capacity and that by his signature on the instrument the person, or the entity
upon behalf of which the person acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the
foregoing paragraph is true and correct

WITNESS my hand and official seal.

/s/ Katrina S. Edwards
Notary Public

My Commission Expires: February 1, 2013

HARMAN FREDERIC W 4