Scott, I agree with you that it could do a better job of providing context as it gives almost none at all. Occasionally I'll cut and paste something more descriptive, but that's just a stopgap. I've noted similar things in the past: https:/
A possibly better version might be a mashup of Known's "Share" funcitonality, but with the proper markup for likes and reposts, but this would take a bit of reconfiguration which I haven't had the itch to fix just yet. My general value on likes and reposts like these is fairly low and if I want to keep more context I use other methods, particularly if I want to keep more context for my personal site search in the future.