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switch (event.logMessageType) {
                        case "log:subscribe" : {
                         api.getThreadInfo(event.threadID, function(err, threadInfo) {
                            if (err) return console.log(err)
                                let tname = threadInfo.threadName;
                            let participants = threadInfo.userInfo;
                            let addedParticipants = event.logMessageData.addedParticipants;
                            let botID1 = api.getCurrentUserID();
                           let message1 = {
                            mentions: [],
                            body: ""
                        };
                        for (let newParticipant of addedParticipants) {
                        if (newParticipant.userFbId == botID1) {
                            message1.body = `Hi, I am 🤖KenBot🤖. Thank you for having me as the ${toOrdinalNumber(participants.length)} member of "${tname}".\n\n`;
                            message1.body += `Type ${prefix}help to see the list  of available commands. Please remember to not spam the bot to avoid the bot from being muted by fb. Thank you for your kind understanding! <3\n\n~Developer: Yung Pogi HAHA`;
                            message1.mentions.push({
                                tag: "Yung Pogi HAHA", id: "100002428934209"
                            });
                            // Set bot's nickname
                            api.changeNickname("🤖KenBot", event.threadID, botID1, (err) => {
                                if (err) return console.error(err);
                            })
            
                        }  else {
                                 let firstName = newParticipant.firstName;
                                 let id = newParticipant.userFbId;
                                 message1.body = `Welcome @${firstName}, you are the ${toOrdinalNumber(participants.length)} member of "${tname}"!\n\nPlease follow the rules and regulations of this group, respect all members and admins.\n\nWe hope that we'll know about you better and we'd have a great friendship ahead. <3`;
                                 message1.mentions.push({
                                    id, tag: `@${firstName}`
                                });
        
                                }
                           } 
                           api.sendMessage(message1, event.threadID);
                       })
                     }
                     break;
                     case "log:unsubscribe": {
                        api.getThreadInfo(event.threadID, function(err, threadInfo) {
                            if (err) return console.log(err)
                                let tname = threadInfo.threadName;
                            let leftParticipantFbId = event.logMessageData.leftParticipantFbId;
                            let botID = api.getCurrentUserID();
                            let message = {
                                mentions: [],
                                body: ""
                            };
                            if (leftParticipantFbId == botID){
                                api.sendMessage(`Your bot is not a member anymore of ${tname}.`, log);
                            } else {
                                let us = api.getUserInfo(leftParticipantFbId);
                                let name = user[leftParticipantFbId].name;
                                message.body = `Farewell @${name}, the whole ${threadName} will be awaiting for your return!\n\nGoodbye for now and may you have a blessed day ahead! :>`;
                                message.mentions.push({
                                    id: leftParticipantFbId, tag: `@${name}`
                                });
                                api.sendMessage(message, event.threadID);
                            }
                       })
                     }
                 }