As a blog writer it is necessary to have a good screen capture application available. Probably the best screen capture extension in the Google Chrome Store right now is Nimbus Screenshot: Capture and Annotate.
Nimbus Screenshot fits in well with ScribeFire, that is also a Chrome browser extension, that I use to draft my blog articles. With both of these extensions in place, all articles that I compose are performed directly in my browser (Google Chrome and/or Chromium) making my writing experience much more pleasant, efficient, and faster.
Nimbus Screenshot gives you the ability to capture a whole Web page (snipping tool), a part of it or the whole browser window. Built in is an optional editor, with a very user-friendly interface, where you can edit your captures, crop your images; AND, add text (or comments), lines, arrows, circles, rectangles, etc… When done you can save your screenshots to your Google Drive or Nimbus account. The free Nimbus account allows you to save up to 100 mbs of data a month.
As a side note, which I need to explore further; Nimbus also offers, in a addition to the Google Chrome browser extension, a screen capture app for the Windows, Android, and Firefox platforms.