Social media and buying property

I got a call last week from Gascoignes Estate Agents in Surrey asking if I could dust off my social media crystal ball and gaze upon how one might use social media to buy a house in the future. So, after some chin stroking, head scratching and a nap deep pontification I penned the following few lines for their e-newsletter:

Until recently social media has not influenced the purchase of property in the way it has for other ‘big ticket’ items such as holidays or vehicles, where a friends’ holiday snaps shared on Facebook might encourage you to book a holiday to the same destination or an automotive forum might warn you off a car with high yearly running costs. However, the deep penetration of ‘smartphones’ in the UK has meant that increasingly our online social networking is done on-the-go. As a result we have greater access to hyper-local knowledge and content about where people are, what they’re doing and what they think about it. Increasingly this information will influence our property buying decisions as we are exposed to a new, deeper layer of knowledge about locales.

The question, then, is whaddaya reckon? Of all the myriad social technologies, which do YOU think already do, or will increasingly influence property buying?