With the recent updates to facebook pages, by facebook, we are reminded that mega companies like facebook and google can do what they want, when they want. This update is far less dramatic that ones in the past but it is a small reminder that if facebook decides to rework a layout and do away with tabs in favour of left navigation, then it will.
More dramatic for developers is all the time some people spend learning FBML only to now be told that they will be phasing it out over time. Stupid idea to start your own markup language really, isn't it. There are open options for this kind of thing which is now apparent as iframes are supported instead.
The thing that is a little unnerving about all this is that after spending $xx on developing things for facebook a company may go under over night because facebook make a change that affects everyone without thought or consequence to anything other than their own agenda.
People developing for facebook you have been warned.