Historical Jesus, Biblical Jesus

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Tacitus didn't necessarily, (and I would think it more probable he didn't) get any information from Christians.
Did he talk to Christians ?
The only reason he would have even heard about the Jesus matter was because various communities with various beliefs about him had arisen.

Christus is a masculine noun written in classical Latin. I feel that since the most common spoken language was Koine the general population, if Tacitus would have heard oi it from the common folk he would have used Christos. Latin was primarily used by the Roman elite such as military, legislative, and administration. It was the language documents were written in.

I seriously doubt Tacitus would have obtained any info from Christians as he obviously hated them, and they obviously feared being detected by the Roman authorities. 

It seems to me that Tacitus got his information from a written Latin source which detailed the precise time under Tiberius of the execution of Christ, when Pilate was Prefect. I think it's an important clue that Tacitus called Pilate a procurator instead of the proper prefect, indicating a non-Christian source. This error is more indicative of a written source in Latin that came into being later in 1st century, around CE 70. By that time, prefects were out of commission and Pilate's old "position" in Judea would have been updated (in Latin) on the books to reflect a Procurator. 

Josephus is one such possible source, since he refers to Pilate as procurator. But Josephus wrote in the Greek, and Tacitus doesn't refer to him in his list of sources which are virtually entirely Roman.

Virtually all known Tacitian sources are Roman, including previous Roman historians, military, legislative, and administrative sources, which again were primarily in Latin.

My candidate for Tacitus' main source for much of his work is the Roman historian Cluvius Rufas, who incidentally is whom Josephus also used.