And should we?  A lot of people are, 
for different reasons....one of them there.
I'm not so sure we should.
I'll freak out if I come to the decision that I don't trust them - but for now I do.  Why?  Because what they are claiming in their TOS is pretty much the same as every other online entity out there.  I think people just happen to be finally noticing it.
Wordpress:
By submitting Content to Automattic for inclusion on your Website, you 
grant Automattic a world-wide, royalty-free, and non-exclusive license 
to reproduce, modify, adapt and publish the Content solely for the 
purpose of displaying, distributing and promoting your blog.
Typepad:
1.5 By signifying your acceptance of this TOS or making any use of the 
TypePad Service, you signify your irrevocable acceptance of this TOS, 
the Terms of Use and the TypePad Privacy Policy in effect at the time of
 your use... 
8.1 TypePad does not claim ownership over the content you post on the 
TypePad Service. After posting your content, you continue to retain your
 ownership of your content and you continue to have the right to use and
 license your content in any way you choose. But by using the TypePad 
Service or TypePad's Web properties through which the TypePad Service is
 available, you are granting TypePad a nonexclusive, worldwide, 
royalty-free, sublicenseable and transferable right and license to use, 
reproduce, create derivative works of, distribute, publicly perform and 
publicly display your content, subject to any restrictions on such 
distribution which you may implement through any content distribution 
controls provided to you by TypePad as part of the TypePad Service. This
 license ends when you delete your content or your account (except to 
the extent that your content has been shared with others or syndicated 
to third parties and they have not deleted it). You may always decline 
to submit content to TypePad, but please be aware that your decision may
 prevent you from being able to use all or portions of the TypePad 
Service. 
Flickr:
...perpetual,
 irrevocable and fully sublicensable [is that a word?!  I guess it is, I see it with a red squiggle line under it up there in the TypePad rules] license to use, distribute, 
reproduce, modify, adapt, publish, translate, publicly perform and 
publicly display such Content (in whole or in part) and to incorporate 
such Content into other works in any format or medium now known or later
 developed.
"Publicly accessible" areas of the Yahoo! Services are those areas of
 the Yahoo! network of properties that are intended by Yahoo! to be 
available to the general public. By way of example, publicly accessible 
areas of the Yahoo! Services would include Yahoo! Message Boards and 
portions of Yahoo! Groups and Flickr that are open to both members and 
visitors. 
SmugMug is quite a bit safer....but still:
You retain the copyright in any User Content you post on the Site.  
SmugMug neither has nor wants any ownership of your Content. However, by
 uploading and/or posting any User Content to the Site, you grant 
SmugMug a perpetual, nonexclusive and royalty-free right to use the User
 Content and the name that is submitted in connection with such User 
Content, as is reasonably necessary to display the User Content, provide
 the Services and to facilitate, at Content Owner's direction, the 
license of Photos or the sale of Products on the Site. 
You understand and acknowledge that any User Content contained in 
public postings, including any galleries that are not designated as 
unlisted, will be accessible to the public and could be accessed, 
indexed, archived, linked to and republished by others including, 
without limitation, appearing on other web sites and in search engine 
results.  Therefore, you should be careful about the nature of the User 
Content you post.  SmugMug will not be responsible or liable for any 
third party access to or use of the User Content you post. SmugMug 
provides many 
security options and 
settings for your content and you should read and understand them all.
And I think we're all pretty aware of Google right now, with their big change recently.   And all of this is old news with regards to Face Book.  
Which Big Brother should we trust?