What linkedin should do now?

Given the recent security breaches (lost password file) and negative
comments about its use of calendar data, I believe that Linkedin needs
some soul searching and find next steps. I have the following
suggestions:

1: Linkedin should take defense in depth approach and revisit the
overall architecture to find potential security holes. One example is
not to use SHA-1 for password hash, use stronger hash algorithm such
as SHA-512 instead. And enforce password policy and complexity, etc.
Linkedin will benefit a lot by hiring a seasoned security director who
has worked extensively in a big consulting firm such as CGI who has
been able to approach the security from defense in depth perspectives
and led many big federal projects (not just one product or one company
like Linkedin) to FISMA compliance and provides high level security.

2: Linkedin recent acquisition of SliderShares is a very smart move.
The next move should target professional video educational service
such as http://www.udemy.com , vimeo, etc.

3: Linkedin should leverage its massive data to do deeper analytic to
predict job trends, company strength, potential merge and acquisition
etc.

4) Linkedin should include a blog site which would not limit the size
of text and allow user to share the blog.

5)Linkedin should create a startup community to link recent startup
companies to share ideas.

6) Linkedin should send more targeted e-mail updates to users based on
its analysis on people's professional interests. For example, my
professional interests are on the cloud, mobile security. I have
joined many such groups and posted many such updates. But, it seems to
me Linkedin did not get it and did not send relevant updates from my
contacts to me via e-mail.

More to follow ...