Firstly, I've got to agree with all of the the comments made by Andrei Volgin... App Engine is an excellent environment for startups and, having made a similar decision to yourself a couple of years ago, I couldn't be happier with my choice.
However, a word of caution for your specific requirement. The social networks rate limit some of their APIs to IP address. Being in App Engine means you're sharing your infrastructure (and IP addresses) with millions of other projects. This makes it almost impossible to connect to some (particularly Twitter) APIs. This might not be a problem if you're OAuthing specific users but its definitely worth checking out. To end on a positive note though... in the past 2 years, our startup business has benefited from having an infinitely scalable architecture coping with numerous unexpected traffic spikes (up to 40x on occasion), with 0% downtime ... all at a cost of <$350 a month. When you look at App Engine alongside its new bed fellows of Cloud SQL, Cloud Storage and Big Query... Google's Cloud Platform is frankly looking like a top notch choice. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/h4liRDYdi6kJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.