[lelandbatey]

I don't think so. I find it more like meta-interaction. You're interacting with the results or consequences of someone else's interactions.

If you're actually talking or communicating, via exchanges of comments or instant messages then I feel that's interaction.

[schuylerlarson]

Liking someone's photo is just as much of a social interaction as complimenting someones dress in person. Just two different mediums.