If you familiar with yahoo messenger , you must be know with bots and spammer because YM is very weak with this things.
To prevent it you can use Anti Boots software for your security . How it works ? the booter targeted your id when you are login to the chat room of yahoo messenger. When you use this free software anti boot I believe you will not see Invite bots, Game bots, etc.

KaoticProtocol Anti Boot is one of anti boot that used to yahoo messenger chat client. When you used this free ware software you just get an anti boot in two modes: Anti Invites and Anti PM

Spark Anti Boot options
anti cam, anti invite, anti boots, anti voice, anti file sender, anti pm or buzzer, anti view share.

Y! Filter Anti Boot

if you need full options anti boots you can use Y! Filter Anti Boot

You can download all this software via link below

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