The best replacement for comments is suggestions.

The best alternatives to comments are rated as following:
★★★★★  suggestions
★★★★  graphics
★★★  questions
★★★  comment
★★  feedback
★★  remarks
★  concerns
★  commentaries
★  disqus
★  positive comments
★  likes
★  complaints
★  docstrings
  testimonials
  notes
  negative comments

Your alternative for comments is not listed? Suggest!
Speaking about comments, one probably shouldn't forget about leaving myspace.

Other search terms related to comments and their ratings are:
★★★★★ leaving myspace
★★★★★ facebook wordpress
★★★★ track changes
★★★ facebook
★★★ pictures for facebook
You have in mind a companion for comments and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of comments in all years. Click on graph for more.
comments
suggestions
graphics