I think, it will be good to make some activity items with bigger font size then another.
For example: Statuses and blog posts should be bigger than comments, friendships and others.

[@paulhastings0 Participant 15 years, 5 months ago]

Ah, interesting idea. It kind of furthers the idea of having different sized avatars.

[@mercime Participant 15 years, 5 months ago]

Sure you could make some activity items with bigger font sizes of respective paragraphs (p) and links (a)
body.activity .groups
body.activity .new_forum_topic
body.activity .activity_update
body.activity .created_group
body.activity .activity
body.activity .has-comments
body.activity .profile
body.activity .new_member
body.activity .mini
body.activity .joined_group
to name a few – Install Firebug, Firefox add-on, to check the classes/ID’s of stream you want to

[@motomac Participant 15 years, 5 months ago]

@mercime, I can’t find these strings in default theme.

[@nuprn1 Participant 15 years, 5 months ago]

you’ll need to add them to your css theme file – bp_activity_css_class() will output various css names depending on the activity type