Some may find the font on the smaller screen to be a bit frustrating, but you can also choose from six font sizes.

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My guess: the smaller font size means Facebook can fit more posts that appear on one screen in the news feed.

FORBES: Facebook: Testing Smaller Font To Make Site 'More Efficient'

The other caveats: Facebook is using the same smaller font size on the new Profile Pages it recently instituted in the News Feed section.

FORBES: New Facebook Profiles: No Downgrade

The new, smaller font size looks like it may be here to stay, since it has been rolled out now not only to the News Feed, but to the new main Profile Pages as well.

FORBES: New Facebook Profile Pages: Now With Smaller Font