I have read in www.islamworl.com that this Jamaah is spreading Shirk and Bid'ah is it true? If it yes then explain to me.

Praise be to Allah, the Lord of the World; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

According to our knowledge Jamat-e-Tableegh does not call towards Shirk (setting partners with Allah). This is a Muslim Jamaah known for its large and vital activities in the field of Da'wah. The Muslim scholars and callers to Islam have various opinions concerning this Jamaah; some of them support it, while others criticize it. The moderate opinion is of those who neither condemn it totally nor approve of it totally, but admire its good activities, which agree with Sunnah, while not agreeing with those activities not from Sunnah. This is the moderate stand and should be adopted by Muslims when evaluating any Muslim group whether it is Jamat-e-Tableegh or another group.
However, to discuss thoroughly the merits of any Muslim Jamaah working in Islam needs extensive knowledge about its curriculum and its method of working. Most probably, first hand observation of its activities is required in order to reach a final conclusion. In fact, we are not in the position to do that.
Finally, we insist on that every individual's and group's activities should be weighed by the Qur'an, Sunnah and the practice of good predecessors; what is in accordance with that should be accepted and what is not should be rejected, and advise them about what is correct.
Allah knows best.