I understand how Yahoo wants to make Mail more relevant in this era of the social network. But I don't think jamming social network-esque features into Mail is the way to solve the problem.
The latest version of Yahoo Mail adds yet another bar to the top of the UI, which they call the Filter Bar in the HTML, but I'm calling the Connections bar. It allows you to see only mail from your "connections" in your Inbox. This might be valuable if I had any connections. But I don't. No one does to start off. You have to invite people to connect and they have to accept.

So why would I want to have people as a connection? According to Yahoo:
Connecting with friends and family allows you to:
- Give their messages higher priority in your Inbox
- Automatically keep up with photos they share online
- Much more coming soon!
This is a pretty weak value proposition in my mind. I have to ask people yet again to connect with me. And for expending this social capital with them, I gain two modestly useful features, and a vague promise of more "soon".
The really frustrating thing is that these features can and should be provided to me regardless of whether or not I am "connected" with the other person. Doesn't the fact that I have them in my address book or in my Sent Items folder mean this is a trusted person I am intersted in?
And why add yet another bar to the UI, which reduces the number of messages I can see in my Inbox? Couldn't this filter be integrated more seamlessly into the UI? I suspect this is a case where the UI is in fact there more for marketing reasons than for usefulness or usability.
Thankfully with UI on the web, there are workarounds. I created this GreaseMonkey script to remove this bar and give me back the full view of my Inbox. Maybe you'll find it useful too.
function addGlobalStyle(css) {
var head, style;
head = document.getElementsByTagName('head')[0];
if (!head) { return; }
style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = css;
head.appendChild(style);
}
addGlobalStyle('#filterbar { display:none; }');
I put this up on Userscripts.org.
Get it here.