Lookery, a marketing solutions provider for social networking sites, has raised a seed fund of $900,000 led by Charles River Ventures, Reed Hundt and Vikas Taneja of HT Ventures, according to its blog. The company helps social networks and advertisers by disseminating demographic information such as age, sex and location—while supposedly maintaining users’ anonymity—from social media sites to advertisers that seek certain audiences. Last July it launched Lookery for Facebook, a display advertising network enabling advertisers to target specific Facebook members through information garnered from the apps they use. It hopes to raise its first round funding in late April.