Lightroom keywords

After keywording a bunch of photos, I read that they need to be seperated by commas. I only used spaces. They come up in a search fine. Is there any reason to use commas?

If you used spaces then all your keywords will be treated as one "keyword".
i.e. Tunbridge Wells would be treated by Flickr as "Tunbridge Wells" where Tunbridge, Wells would be treated as "Tunbridge" and "Wells".
Searching finds your keywords still because it finds anything in the string of keywords, even though they are all basically one "keyword". So by my example above, I can search for "Wells" and it will find it no matter if I used space or commas, but I don't know how other programs would treat them once exported though.
Get those commas in there for future proofingness.

Thanks for the explanation! I'll fix them all with commas.

dirt lover wrote in post #4933190
Thanks for the explanation! I'll fix them all with commas.

Don't forget to delete those huge keywords you would've made to stop inserting them by accident in future.

Oh yeah. Thanks.

How can I add keywords to a set of photos after I 'select all' photos without overwriting the keywords that are there?

I don't think it will overwrite the keywords that were there. That would imply that you can only enter keywords once or that anytime you decided to add a keyword you'd have to enter that new one and all previous keywords.

I don't have Lightroom on this computer that I'm at right now so I can't verify this but I don't think you should worry.

Entering keywords for selected photos doesn't even do anything... It applys the keyword to the first one.

Enter the keyword for the first image; then select ALL the images you want to tag, and drag the images to the Keyword in the Keywording Panel on the left side of the screen.