i think:
LinkedIn useful for business
Twitter useful for private

i found linkedin is the best. no doubt.. it has job opportunity also. and connect within their professional network

Register on both site and use them to know the actual difference between them.

Both of Social Media Site are the good. facebook, LinkedIn And Twitter is best Social Networking site.

linkedIn is the best

The main difference between twitter and linkedin are that LinkedIn is very professional networking websites, it is having more then 100 million users.
Twitter is a social networking website which is basically used for tweet, there are nearly about 200 million users using 140 character at a time.

Twitter is the best platform obviously!!!

The profiles in Facebook are created for the purpose of connecting to friends and family to keep in touch and in LinkedIn is more business-oriented mainly for professional networking.

register all and use it you will see

Use them to know the actual difference between them.

Do not ask such questions because this is totally spamming.Now a days everybody is aware about linkden and twitter.

yes , i agree with you. linkedin is provide best business opportunity.

Yes, Twitter and LinkedIn both are different social networking sites, Twitter is an online social networking service generally using for real time promotion of the brand or business while LinkedIn is a professional networking site. Most of the time I prefer an open source social media enabling technology with Socioboard Core that help me to understand the power of networking sites.

Both are Social Networking site but twitter are use contaminate any person & Linkedin are use Professional person.

Linkdin is basically used for professional use.