The other thought as well as setting a cap is to have a separate tab chat tab for all players under say level 20 and let the moderators help them and leave them to make friends with others of same level. Any that ask for a Guild the Moderators would then suggest the correct place the Recruitment threads.
G1 is full of people with access to their own Guild Chat yet spend lots of time in there so when a new player comes in they are surrounded by people with Tags and just possibly wrong motives. I think new players young in age and those who cannot speak much english need a bit of extra attention.
I also think the Guilds' members lists should be uncovered again. This was extremely useful to check someone really could have a FT lootspot for sale and could have some benefit in highlighting guilds that are just taking in low levels and them not levelling up.