It's sad that founders do this kind of thing to their users. Why not sell the company to Facebook (with attendant personnel agreements), but sell the assets (users, technical infrastructure) to a competitor at a steep discount, maybe in exchange for shares?
That way their users have a fighting chance at a smooth transition, and the technical contribution you made can continue.
I upvoted you and agree. However, there is also that the shutdown may be driven by facebook for a variety of reasons. As a founder, it is probably really hard to walk away from an offer that is very attractive personally but bad for the service.
On the other hand, starting with that mentality is probably bad. c.f. pg's "do something you think is good for the world"
I agree. As more and more services close, customers will be wary of putting content online or using a public online service. Thats the reason we started Tonido.
That way their users have a fighting chance at a smooth transition, and the technical contribution you made can continue.