It is a pleasure to welcome you to the Phantom Pilots forum. I hope that you will take advantage of the benefits that come with membership and that you will be able to use the forum for the exchange of innovative ideas and as a resource for current developments in Phantom quadcopter’s.
There are lots of threads here with that same question. Try a search and you may find some info to help you. At this point in time the answer is almost always 'no, you can not'.
" The FAA has consistently defined commercial operation in terms of whether the operator receives direct or indirect payment for the operation. It is not necessary that the operation be conducted for profit or even that there be any intent or ability to make a profit. The compensation is not just limited to monetary payments but includes anything of value. This broad definition of compensation has been affirmed and adopted by both the NTSB and the federal courts. Administrator v. Roundtree, 2 NTSB 1712 (1975); Administrator v. Mims, NTSB Order No. EA-3284, review denied 988 F.2d 1380; Consolidated Flower Shipments, Inc., Bay Area, 16 C.A.B. 804 (1953), aff'd. 213 F.2d 814 (2nd Cir. 1954)."