I didn't watch the videos. (from the stills it looks like it might be some out of control Southern Baptists/Pentacostals). I never did like out of control, crazy worship stuff. Some people become fanatics concerning spiritual things and can get very scary. There should always be order in the church.
That said, Jesus told the disciples -
Mar 16:17
And these signs shall accompany them that believe: in my name shall they cast out demons; they shall speak with new tongues;
Mar 16:18
they shall take up serpents, and if they drink any deadly thing, it shall in no wise hurt them; they shall lay hands on the sick, and they shall recover.
Believers baptized in the Holy Spirit will do these things. It isn't them doing it, it is the HS moving through them.
Act 19:6
And when Paul had laid his hands upon them, the Holy Spirit came on them; and they spake with tongues, and prophesied.
That was the initial response to being baptized in the HS. To the one baptizing, it would a be a sign that the people were actually baptized. When I was baptized in the HS I spoke in tongues. It wasn't loud, wasn't crazy, wasn't forced. When the guys at the men's home group laid their hands on me, my mouth opened, and, I started speaking in another tongue. And those in the group knew it had worked. After that, we went on with Bible study. I've healed the sick and cast out demons by the HS also. Prophecied in the congregation once. Now that's heavy. When the HS drops down on you, there is no mistaking it. And good fruits follow, and people are edified, or healed, or demons cast out. And you will speak in tongues too.
Speaking in tongues in the congregation is different from speaking in tongues when you are praying for someone for healing or whatever. In the congregation people are supposed to be edified thus need an interpretation. Outside of a church service etc, believers sometimes speak in tongues because of the spiritual situation at the time. It seems to be more prevalent when people are meeting together for prayer, or for healing. The tongues that are spoke come out softer (as opposed to louder in the congregation because people need to hear). In any case it's the HS giving the utterance. Of course, Satan can replicate the gift. But the fruits would be evident. People should be aware of what kind of situation they are in, and if they should speak in tongues at all.
1Co 14:5
Now I would have you all speak with tongues, but rather that ye should prophesy: and greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying.
Hearing a tongue interpreted edifies the same as hearing a prophecy. There is just an extra step added in getting to the message. Seeing a tongue spoken, and then, the HS speak through another giving the interpretation is a very cool thing. It's one of those things that lets you know, "wow, God
is here." I've only seen that happen a few times though. The gift of prophecy seems to be more prevalent (at least at the church I used to go to). And, hearing the HS speak through a person is an awesome thing. That's God (the HS) dropping down on a person and speaking directly to his people. Absolutely
amazing.
Same thing happened in old times -
Num 11:25
And Jehovah came down in the cloud, and spake unto him, and took of the Spirit that was upon him, and put it upon the seventy elders: and it came to pass,
that, when the Spirit rested upon them, they prophesied, but they did so no more.
In any event, if tongues are spoken in the congregation, there should be an interpreter, and, there should be leaders who make sure that there is order to the process. If there is an interpreter, someone with a tongue should speak, and, if some receive a prophetic word, 2 or 3 of them should speak with the leaders overseeing the process so it doesn't get out of control.
At least, that's what it says in the Bible.