Forums - What do these things mean?
The arrow I think you are referring to you I believe is the one indicating you have replied in said thread
Does it show an arrow for you on this thread now?
aye it does show the arrow
I believe the red underline beneath the thumb’s-up indicates that it is currently the most popular post on the forum.
https://forum-en.gw2archive.eu/forum/info/news/Updates-to-the-Forum-1-System/first#post1393636
The swoopy arrow means that you have replied in that thread.
Here is a snippet from the forum update notes about the +1 system.
…there are two levels of popularity, categorized “popular” and “very popular”.Currently these are indicated by a thumbs-up icon that appears next to the +1 button. If a post is very popular, the thumbs-up earns a star that appears within said icon.
Our future plans include updating these indicators to something more visually striking. Until then, this is how you will know if a post has achieved popular status.
There are also two levels in which posts are gauged for popularity, on a per-thread basis and forum-wide. Forum-wide popularity takes into account +1s from within a set time period across the forum. Per-thread popularity takes into account all +1s in a thread. Visually, a forum-wide popular post will have a red underline beneath the thumbs-up icon.
The original post can be found at https://forum-en.gw2archive.eu/forum/info/news/Updates-to-the-Forum-1-System/first#post1393636.