def should_record_thread(self, participants):
        """
        Determines if the thread should be parsed based on the
        participants and the filter given.

        For example, if the filter states ['jack', 'billy joe'],
        then only threads with exactly two participants
        (excluding the owner of the chat history) containing
        someone with the first or last name 'Jack' and someone
        named 'Billy Joel' will be included.

        Any of the following would match that criteria:

            - Jack Stevenson, Billy Joel
            - Billy Joel, Jack Stevens
            - Jack Jenson, Billy Joel
            - Jack Jack, Billy Joel

        participants -- the participants of the thread
                        (excluding the history owner)
        """
        if not self.thread_filter:
            return True
        if len(participants) != len(self.thread_filter):
            return False
        participants = [[p.lower()] + p.lower().split(" ")
                        for p in participants]
        matches = defaultdict(set)
        for e, p in enumerate(participants):
            for f in self.thread_filter:
                if f in p:
                    matches[f].add(e)
        matched = set()
        for f in matches:
            if len(matches[f]) == 0:
                return False
            matched |= matches[f]
        return len(matched) == len(participants)
Determines if the thread should be parsed based on the
        participants and the filter given.

        For example, if the filter states ['jack', 'billy joe'],
        then only threads with exactly two participants
        (excluding the owner of the chat history) containing
        someone with the first or last name 'Jack' and someone
        named 'Billy Joel' will be included.

        Any of the following would match that criteria:

            - Jack Stevenson, Billy Joel
            - Billy Joel, Jack Stevens
            - Jack Jenson, Billy Joel
            - Jack Jack, Billy Joel

        participants -- the participants of the thread
                        (excluding the history owner)