Yes you could always message them back but why should you when they don't have the courtesy to send you a quick message in the first place. It take 30sec to write what you are needing help with. Any invite that I get with no description will get ignored. I don't mind helping people with anything especially lower level players with story missions but please just include a message. It's even worse when someone keeps spamming you with an invite every 5 seconds. If I've not replied to your first 5 invites what makes you think I'm going to reply to the 6th, 7th or 8th.

As I said, they are likely just inviting [u]everyone[/u] in the tower. It might take 30 seconds to send a message, but that's 30 seconds [b]per invite[/b]. Assuming a full lobby of 16 players. 30x16=480 seconds 480 seconds = [u][b]8 minutes[/b][/u] Whereas you receive an invite from [u][b]one[/b][/u] person. 30x1.... You get the idea. I'm not criticising you, random invites annoy me sometimes too. But if you're not willing to spend 30 seconds to simply [u][b]ask[/b][/u] what a Guardians planned activity is, I refuse to believe you are willing to dedicate about an hour or two helping newbies through a Raid.