Plink, the venture-backed developer of online loyalty programs, said today that it has named Marc Marin as Chief Marketing Officer. Marin was previously at PurePlay, and also had worked with Plink CEO Peter Vogel and other team members at Memolink.com. Marin was co-founder and CIO at MemoLink. Plink recently announced a $3M Series A from Grotech Ventures for its online-to-offline loyalty programs, which reward people for shopping and dining at restaurants and stores with gift cards and online rewards. Plink is based in Denver.