Hi Karen,
There is not a "Like" feature out of the box, however, you may be able to leverage the Content Rating web part. This control allows you to "vote" on any page of content. Normally, this is implemented with a sliding scale (1-5, etc.), however, you could set the "Max rating value" = 1. Then you could change the "result" message to "Total Like: {1}" or something. Basically, you would be using the rating control with a single value, to simulate a "like" feature.