IMedExchange, a social networking site for doctors, has raised $2.5 million from various angels, according to Seattle PI. All but two of the company’s 40 investors are doctors themselves. The Seattle-based company, which is launching this month, wants to be a place where doctors can exchange professional info, while also doing traditional social networking stuff, like chatting about their personal interests. The big competition in the space is heavily backed Sermo, which is very tightly focused on the exchange of industry knowledge.